HBase操作命令DDL（2）

创建表 create

指令格式：create 表名，列簇1，....，列簇n

hbase(main):010:0> create 'tbTest','col-familyA','col-familyB'
0 row(s) in 2.4910 seconds

查询表 list

hbase(main):011:0> list
TABLE

t1

tbTest

2 row(s) in 0.0040 seconds

=> ["t1", "tbTest"]

表描述 describe

指令格式： describe 表名

hbase(main):015:0> describe 't1'
Table t1 is ENABLED

t1

COLUMN FAMILIES DESCRIPTION

{NAME => 'f1', BLOOMFILTER => 'ROW', VERSIONS => '2', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACH
E => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

{NAME => 'f2', BLOOMFILTER => 'ROW', VERSIONS => '2', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOCKCACH
E => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

2 row(s) in 0.0780 seconds

禁用表 disable

指令格式： disable 表名

hbase(main):016:0> disable 't1'
0 row(s) in 4.4590 seconds

删除表 drop （删除表要先禁用(disable)表）

指令格式： drop 表名

hbase(main):017:0> describe 't1'
Table t1 is DISABLED

2 row(s) in 0.0480 seconds

hbase(main):018:0> drop 't1'
0 row(s) in 2.3840 seconds

启用表 enable

指令格式： enable 表名

hbase(main):020:0> disable 'tbTest'
0 row(s) in 2.3030 seconds

hbase(main):022:0> enable 'tbTest'
0 row(s) in 2.3820 seconds

验证已经启用表

指令格式： is_enabled 表名

hbase(main):023:0> is_enabled 'tbTest'
true

验证已经禁用表

指令格式： is_disabled 表名

hbase(main):024:0> is_disabled 'tbTest'
false

验证表存在 exists

指令格式： exists 表名

hbase(main):029:0> exists 'tbTest'
Table tbTest does exist

修改表 alter （修改前要先禁用表）

指令格式： alter 表名，指令1，......，指令m

模版

There could be more than one alteration in one command:

  hbase> alter 't1', { NAME => 'f1', VERSIONS => 3 },
   { MAX_FILESIZE => '134217728' }, { METHOD => 'delete', NAME => 'f2' },
   OWNER => 'johndoe', METADATA => { 'mykey' => 'myvalue' }

增加列

hbase(main):040:0> alter 'tbTest',NAME => 'col-familyC'
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 2.5760 seconds

hbase(main):042:0> describe 'tbTest'
Table tbTest is DISABLED

tbTest

COLUMN FAMILIES DESCRIPTION

{NAME => 'col-familyA', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0',

BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

{NAME => 'col-familyB', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0',

BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

{NAME => 'col-familyC', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'NONE', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0',

BLOCKCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}

3 row(s) in 0.0560 seconds

删除列

hbase(main):003:0> alter 'tbTest',{NAME=>'col-familyC',METHOD=>'delete'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 3.0540 seconds

清空表数据 truncate （清空前表要启用）

指令格式： truncate 表名

hbase(main):007:0> enable 'tbTest'
0 row(s) in 2.3410 seconds

hbase(main):008:0> truncate 'tbTest'
Truncating 'tbTest' table (it may take a while):
 - Disabling table...
 - Truncating table...
0 row(s) in 5.0260 seconds

删除匹配表 drop_all （删除表前要禁用表）

指令格式： drop_all 正则表达式

hbase(main):012:0> list
TABLE

t1

t2

tbTest

3 row(s) in 0.0310 seconds

=> ["t1", "t2", "tbTest"]
hbase(main):013:0> drop_all 't[0-9]'
t1

t2


Drop the above 2 tables (y/n)?
y

HBase操作命令DDL（2）

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